Teaching unions says they have been left with “unanswered questions” from the government over whether children and staff will be safe if schools reopen in England, following a meeting between with chief scientific advisers on Friday.

Now the British Medical Association (BMA) has reinforced the unions’ concerns - saying government should not consider reopening schools on 1 June in England until COVID-19 case numbers are “much lower”.

Plans to reopen schools on 1 June have drawn concerns from teachers and unions. (Getty Images)

In a letter to National Education Union (NEU) joint secretary, Kevin Courtney, BMA chief executive Dr Chaand Nagpaul said the teaching body was "absolutely right to urge caution" over schools reopening.

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"In light of these studies...the view of the members of the PHMC is completely aligned with the NEU that, until we have got case numbers much lower, we should not consider reopening schools," the letter said.

"The NEU is absolutely right to urge caution, to prioritise testing and to protect the vulnerable. We cannot risk a second spike or take actions which would increase the spread of this virus, particularly as we see sustained rates of infection across the UK."

We’ve written to @NEUnion to offer our support to teachers and education professionals who are urging caution over plans to reopen schools before there is clear evidence to support the safety of such a move. pic.twitter.com/AXbrtfH0z3

Dr Nagpaul added that the BMA fully supported the NEU's five tests of school safety to be met before pupils return.

"In response to the government's announcement this week on easing lockdown restrictions, I said that I believed their plan was too fast, too confusing and too risky. They would do well to heed your five tests before taking any further premature actions,” he continued.

Other scientists have urged caution of school re-openings.

Dr Catherine Carroll-Meehan, of the University of Portsmouth, warned how “some stark facts about the incidence of the virus and the number of recoveries should be published to allay fears”.

But in contrast, University of Southampton Professor Saul Faust backed the government’s plan, saying: “Society has to reopen, children need to return to school as there are negatives for many of having to stay at home and we need to be able study transmission dynamics in all ages to help us learn how to manage this virus.

“Slowly opening schools in a controlled way will be of low risk to children’s health and less risk to teachers than the risk to many other workers when on public transport/in other work environments.”